御三時[osanji] three-o'clock snack
三鞭酒[shanpen] champagne
球面三角法[kyuumensankakuhou] spherical trigonometry
胸三寸[munesanzun] heart
元三[ganzan] New Year's period (January 1st to 3rd)

五十三次[gojuusantsugi] the 53 Toukaidou stages
向こう三軒[mukousangen] one's next three neighbors
降三世明王[gouzanzemyouou] Trailokyavijaya Vidya-raja
再三[saisan] again and again
再三再四[saisansaishi] repeatedly

欧洲[oushuu] Europe
濠洲[goushuu] Australia
砂洲[sasu] reef
中洲[nakasu] sandbank (in a river)

満洲[manshuu] Manchuria
五大洲[godaishuu] the Five Continents
三角洲[sankakusu] delta
八洲[yashima] Japan